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ABSTRACT: sulfate-reducing bacteria stabilization remediation of Cr (VI)-contaminated soil

PROVIDER: PRJNA678457 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR13078100.fastq.gz	Fastqsanger.gz
	SRR13078101.fastq.gz	Fastqsanger.gz
	SRR13078102.fastq.gz	Fastqsanger.gz
	SRR13078103.fastq.gz	Fastqsanger.gz
	SRR13078104.fastq.gz	Fastqsanger.gz

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Global transcriptional analysis of Cr(VI)-adapted cells of Klebsiella sp. AqSCr

Project description:Hexavalent chromium (Cr(VI)) is a highly toxic contaminant, some bacteria are able to transform it to less toxic and less soluble trivalent chromium (Cr(III)). Klebsiella sp. strain AqSCr, isolated from Cr(VI)-polluted groundwater, reduces Cr(VI) both aerobically and anaerobically, and resists up 35 mM of Cr(VI); Subculturing of AqSCr in the presence of Cr(VI) conduces to adaptation. In this study, we performed RNA-Seq of Cr(VI) adapted stage, finding 255 genes upregulated and 240 downregulated with respect to controls without Cr(VI). Genes differentially expressed are mostly associated with oxidative stress response, DNA repair and replication, sulfur starvation response, envelope-osmotic stress response, fatty acid metabolism, ribosomal subunits and energy metabolism. Among them, genes not previously associated with chromium resistance as cybB, encoding a putative superoxide oxidase, gltA2, encoding an alternative citrate synthase, and des, encoding a fatty acid desaturase were upregulated. The alternative sigma factors fecl, rpoE and rpoS were upredgulated in Cr(VI) adapted cells, then they participate in orchestate the Cr(VI)-resistance mechanisms in AqSCr strain

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Project description:Cr(VI) is a common bioavailable toxic metal that can cause oxidative stress, DNA adducts, and perturb normal gene expression. Changes in gene expression are useful biomarkers of toxicant exposure that provide information about the health of an organism, its ability to adapt to its environment, and indicate potential toxicant-specific effects. Therefore, we developed a toxicology array to the estuarine sentinel species Fundulus heteroclitus, or mummichog. Adults males were exposed to Cr(VI) for 7-days at 0, 1.5 (NOEC), or 3 mg/L (LOEC). Livers were excised and RNA isolated. Adults are used in the laboratory experiments so that we can compare laboratory studies to fish caught at chromium-contaminated field sites. Cr(VI) altered the expression of 12 genes in adult liver, including hepatic growth factor activator, heart fatty acid binding protein, and complement component C3-2. Keywords: dose response

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